Begood
Full Access Member
I would guess that the TPS might be part of the problem.
TPS is throttle position sensor.
Bill.
TPS is throttle position sensor.
Bill.
Truck just died.
- Thread starter FlyingLow
- Start date
This just happened all of a sudden. There were no warning signs. Any idea on the P0031? Can someone verify it is the front left sensor?
Begood said:
I thought about that but I don't know how to check or exactly where it is located.
500snakz said:
I wondered about that also or the fuel filter.
Begood
Full Access Member
It is on the passenger side of the throttle body. I don't know how to check it out though.FlyingLow said:
Bill.
Bone said:
None that I have seen.
tps is on the throttle body, i havent really looked at the one on my truck, but 99% of them have 3 wires, 1 is a ground, one is the power usually 5 volts, and the last one send the signal to the ecu, at idle it will be probably around .4 to .8 volts, and voltage would varydepending on the positions of the throttle, WOT would equal full voltage of the main power wire.
P0031 is the code for the heater control circuit voltage low for the O2 sensor. This is not the O2 sensor itself, but the heater. In order for the O2 sensor to work correctly it needs to be heated over 680 degrees F. The PCM will not read the sensor correct until it achieves this temperature. The PCM controls the voltage to the heater circuit. It appears there may be a problem with that circuit. Replacing the O2 sensor will not fix it. I am not sure if there is a relay for the O2 heater, but that is one place I would start looking as well as the circuit output from the PCM. Some heater circuits will not energize unless the vehicle is running (I believe this is common on newer vehicles). You can test the output between the harness and sensor. You will need check the FSM for the specs on the voltage, amps, and resistance values. Maybe someone can chime in here with those values, but if I get some time I will see if I can find the diagnostic procedure.
-Muzzy
-Muzzy
Bone said:
Is that scanner different then the SCT? It only shows me the code.
Begood
Full Access Member
I ment the TPS. The fuel pump is in the gas tank.Bone said:
Bill.
Turtle
New Member
Begood said:
I think that is suppose to read "meant"
Bone said:
The scan tool will tell you pretty much the same as what the code says. Sure you will see the low voltage reading on the tool. What it won't tell you is why the voltage is low. That is where you have to start checking the wiring and the harness for shorts or an open.
-Muzzy
Muzzy said:
It won't tell you why, but it will tell you if it is a hard failure, with low voltage, or a fluctuating reading for a slow sensor or poor sensor.
I agree, check the wiring first for a cut/melt/loose wire. That was my first suggestion.
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